1. When she repped USC

A dressed-down Kourtney paid tribute to her late father, University of Southern California grad Robert Kardashian, on a day that she left her more luxe garb at home. “Dad’s shirt,” she wrote. (Photo: Kourtney Kardashian via Instagram)

13 times Kourtney Kardashian was everybody's mom on Instagram

ICYMI — and you probably didn’t, because the Kardashians rarely go unnoticed on social media — this week Kourtney Kardashian shared two photos in a row of herself wearing only a string bikini on a Mexican vacation. But what you might not have noticed is that, among all the glam and often racy snapshots on her Instagram page, the Keeping Up With the Kardashians star has also posted some unpretentious photos, mostly of her life as a mom to Mason, 8; Penelope, 5; and Reign, 3.